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ニセコなだれ情報 第61号 Niseko Avalanche Info No.61

山麓0度湿雪5cm、モイワ800m-1.0度東1.7m/s軽い湿雪5cm濃霧、見返り分岐風弱く降雪5cmふきだまり発達東からわずか、アンヌプリ1120m積雪深220cm、ヒラフ山頂-5度南の強風、水野の沢ノール-2.37度南5.2m/s山麓積雪深151cm、アメダス寿都2.0度南南東4.7m/s積雪深42cm、倶知安0.8度南2.3m/s積雪深151cm、弁慶岬南3m/s、神威岬北東4m/s気圧995hPa波高0.5m、

 

低気圧前面で気圧の傾きゆるくおだやか。標高1000m以上は南風が強い。観察から朝のうち雪崩リスクは低いが午前10時以降標高1000m付近風下急斜面のリスクは急激に高まる。現在の降雪は2月3-4日層として今後の雪崩発生面となる見込み。低気圧降雪は量が増えればスラブ化して森の中でも雪崩れやすくなるので注意。

 

雪崩事故は冬型の気圧配置で積雪が増えスラブ化(雪板化)した斜面で起きやすい。いつも滑っている斜面が今日も安全とは限らない。天候に合わせた柔軟な計画を。事故の後で原因がわかっても死者は還らない。ビーコンやエアバッグは万能ではない。常に用心深い行動を。森の中の雪は良いが視界が悪い。天候急変、転倒衝突に注意。ビーコンはオンになっているか?。山は天気が良い時に行くに限る。良い一日を。 

 

Mountain Base 6.00am: 0°, 5cm new wet snow. Moiwa 800m: -1.0, E1.7m/s, 5cm light wet snow, foggy. Mikaeri Weather Station: light winds, 5cm new snow, minor snowdrift development from the east. Annupuri 1120m: snow depth 220cm. Hirafu Peak: -5°, strong southerly wind. Mizuno no Sawa Knoll : -2.37°, S5.2m/s, mountain base snow depth 151cm. Suttsu Weather Station: 2.0°, SSE4.7m/s, snow depth 42cm. Kutchan Weather Station: 0.8°, S2.3m/s, snow depth 151cm. Cape Benkei: S3m/s, Cape Kamui: NE4m/s, pressure 995hPa, wave 0.5m.

 

Preceding a low pressure front the atmospheric pressure gradient is shallow and weather is calm. Above 1000m a strong southerly wind is blowing. From this mornings observation the avalanche risk is low, however after 10am expect the avalanche risk to increase rapidly on leeward steep slopes around 1000m. The current snowfall (Feb3-4)is expected to become a future avalanche fracture face. Take care if we get increased falls of low pressure snow, slabs will form that fracture and slide easily, even in the trees.

 

When we have a typical winter weather pattern and increased snowfall forming slabs, avalanche accidents can easily occur. A slope you were riding yesterday may not be safe today. Make flexible plans to suit the weather. Hindsight is 20/20 but wont help the dead. Beacons and airbags are no guarantee of safety. Always make cautious decisions. Snow in the trees is good but visibility is bad. Be careful of a sudden change in weather, falling, hitting things, collisions. Is your beacon on? Good weather is always safer in the mountains. Have a good day.

| - | 07:37 | - | - | pookmark |